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linux/net/9p
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Dominique Martinet 7030ab2d41 9p/net: put a lower bound on msize 
commit 574d356b7a upstream.

If the requested msize is too small (either from command line argument
or from the server version reply), we won't get any work done.
If it's *really* too small, nothing will work, and this got caught by
syzbot recently (on a new kmem_cache_create_usercopy() call)

Just set a minimum msize to 4k in both code paths, until someone
complains they have a use-case for a smaller msize.

We need to check in both mount option and server reply individually
because the msize for the first version request would be unchecked
with just a global check on clnt->msize.

Link: http://lkml.kernel.org/r/1541407968-31350-1-git-send-email-asmadeus@codewreck.org
Reported-by: syzbot+0c1d61e4db7db94102ca@syzkaller.appspotmail.com
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2019-01-13 09:24:07 +01:00
..
client.c 9p/net: put a lower bound on msize 2019-01-13 09:24:07 +01:00
error.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
Kconfig IB: Revert "remove redundant INFINIBAND kconfig dependencies" 2018-05-28 10:40:16 -06:00
Makefile 9p: Remove p9_idpool 2018-08-29 13:39:57 +09:00
mod.c 9p: Use a slab for allocating requests 2018-08-29 13:39:57 +09:00
protocol.c 9p: p9dirent_read: check network-provided name length 2018-09-08 01:52:29 +09:00
protocol.h net/9p: Convert net/9p protocol dumps to tracepoints 2011-10-24 11:13:12 -05:00
trans_common.c net/9p: correct some comment errors in 9p file system code 2018-05-10 08:21:53 -04:00
trans_common.h net/9p: remove (now-)unused helpers 2015-04-11 22:28:29 -04:00
trans_fd.c 9p/trans_fd: put worker reqs on destroy 2018-10-10 09:14:34 +09:00
trans_rdma.c 9p/rdma: remove useless check in cm_event_handler 2018-09-08 01:52:22 +09:00
trans_virtio.c Merge branch 'work.afs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2018-11-03 10:35:52 -07:00
trans_xen.c 9p: Add refcount to p9_req_t 2018-09-08 01:39:47 +09:00